Water all checked out good. I did a pwc
. Filter media I have in the overflow spout was clogged and was reducing flow rate, so I removed it. Probably will not put it back.
On closer examination of the small scallop it was not dead, just upside down on the tank bottom. Possibly overreacted a tad.
I direct feed both cyclopese and the smaller one opened up a little. The larger did close a bit, but you can see the mantle has receded a bit in the shell. I am hoping it will come back.
As for angels and inverts I have never seen them interact with the scallops at all.
I know scallops are tricky in an aquarium, but I have had limited success with them in the past.